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| Effect of different types of magnesia-carbon bricks on corrosion resistance of vanadium-rich slag |
| ZHAO Jinxuan1, XIAO Feng2, ZHAO Bo1, DU Yihao3, WU Wei1, WU Wei1 |
1. Metallurgical Technology Institute, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China;
2. Sichuan Desheng Group Vanadium and Titanium Co., Ltd., Leshan 614900, Sichuan, China;
3. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, Henan, China |
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Abstract At present, magnesia-carbon brick is used as the lining of vanadium extraction converter. It is of great practical value to evaluate the erosion rate and damage mechanism of different types of magnesia-carbon bricks for improving the service life of vanadium extraction converter. The static slag resistance method was used to simulate the erosion of six kinds of magnesia-carbon bricks under the condition of resistance furnace, and the corrosion resistance and mechanism of magnesia-carbon bricks to vanadium-rich slag were discussed. The results show that MT-C12B and MT-C14A samples are less thinned after erosion by slag. Among them, the erosion area of MT-C12B accounts for 2.98%, and the erosion area of MT-C14A accounts for 2.74%. From the microstructure of the sample erosion, the decarburization layer depth of MT-C12B is the smallest, which has little effect on the performance of magnesia-carbon brick, and is the best choice for vanadium extraction converter. The corrosion mechanism of the six magnesia-carbon bricks is basically the same. The graphite in the magnesia-carbon brick reacts with V2O3, Cr2O3 and FeO in the slag to form a metal phase, resulting in the exposure of MgO particles. The V2O3 in the slag enters the decarburization layer with the slag, reacts with MgO here, and forms a vanadium-containing spinel phase (MgV2O4) on the surface of the magnesia-carbon brick. Moreover, SiO2 and CaO in the liquid slag phase react with MgO particles to form a new low melting point liquid slag phase, and then complete the dissolution process of periclase. The formation of vanadium-containing spinel phase on the surface of MgO-C brick can significantly increase the densification degree of decarburization layer and prevent the further penetration of slag. Therefore, the erosion rate of the material gradually decreases, and finally a relatively slow erosion process is formed. The research results can provide a basis for improving the lining life of vanadium extraction converter.
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Received: 29 August 2023
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2024, Vol. 34 
